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        <TitleTxt>Board Member</TitleTxt>
        <AverageHoursPerWeekRt>4</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Nancy Yang</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
        <AverageHoursPerWeekRt>4</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Jonathan D Klein</PersonNm>
        <TitleTxt>President</TitleTxt>
        <AverageHoursPerWeekRt>4</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Ann Bakewell Woodward</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHoursPerWeekRt>4</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>D D Willard Gardiner Jr</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
        <AverageHoursPerWeekRt>4</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Peter C Erichsen</PersonNm>
        <TitleTxt>Secretary</TitleTxt>
        <AverageHoursPerWeekRt>4</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
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        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Temba Maqubela</PersonNm>
        <TitleTxt>Headmaster</TitleTxt>
        <AverageHoursPerWeekRt>60</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
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        <OfficerInd>X</OfficerInd>
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        <OtherCompensationAmt>167241</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Arthur Diaz</PersonNm>
        <TitleTxt>Chief Financial Officer</TitleTxt>
        <AverageHoursPerWeekRt>50</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>255236</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>99920</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>John MacEachern</PersonNm>
        <TitleTxt>Director of Development</TitleTxt>
        <AverageHoursPerWeekRt>50</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>250529</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>88490</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Elizabeth Preston</PersonNm>
        <TitleTxt>Chief Technology Officer</TitleTxt>
        <AverageHoursPerWeekRt>50</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>156940</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>38173</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Ian Gracey</PersonNm>
        <TitleTxt>Director of Admissions</TitleTxt>
        <AverageHoursPerWeekRt>50</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>147152</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>91572</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Harold W Anderson III</PersonNm>
        <TitleTxt>Assistant Headmaster</TitleTxt>
        <AverageHoursPerWeekRt>50</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>140059</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>151877</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Elizabeth Lawrence</PersonNm>
        <TitleTxt>Development Leadership Gift Officer</TitleTxt>
        <AverageHoursPerWeekRt>50</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>127053</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>52813</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
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      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>690086</TotalOtherCompensationAmt>
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      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Mahan Slate Roofing Company</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>699 Silver Street</AddressLine1Txt>
            <CityNm>Agawam</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>01001</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Construction</ServicesDesc>
        <CompensationAmt>1691968</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>FLIK</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>2 International Drive</AddressLine1Txt>
            <CityNm>Rye Brook</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>10573</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Food Service</ServicesDesc>
        <CompensationAmt>1610975</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>Cambridge Associates</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>125 High Street</AddressLine1Txt>
            <CityNm>Boston</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02110</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Investment Consultant</ServicesDesc>
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      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>Eagle Cleaning Corporation</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>997 Millbury Street</AddressLine1Txt>
            <AddressLine2Txt>Suite A</AddressLine2Txt>
            <CityNm>Worcester</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>01607</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Custodial Service</ServicesDesc>
        <CompensationAmt>581283</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>Robert L Fulmer</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>184 Vista View Drive</AddressLine1Txt>
            <AddressLine2Txt>PO Box 434</AddressLine2Txt>
            <CityNm>North Conway</CityNm>
            <StateAbbreviationCd>NH</StateAbbreviationCd>
            <ZIPCd>03860</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Construction</ServicesDesc>
        <CompensationAmt>337027</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>12</CntrctRcvdGreaterThan100KCnt>
      <FederatedCampaignsAmt>0</FederatedCampaignsAmt>
      <MembershipDuesAmt>0</MembershipDuesAmt>
      <FundraisingAmt>0</FundraisingAmt>
      <RelatedOrganizationsAmt>0</RelatedOrganizationsAmt>
      <GovernmentGrantsAmt>0</GovernmentGrantsAmt>
      <AllOtherContributionsAmt>21871686</AllOtherContributionsAmt>
      <NoncashContributionsAmt>1362067</NoncashContributionsAmt>
      <TotalContributionsAmt>21871686</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>Tuition</Desc>
        <BusinessCd>611600</BusinessCd>
        <TotalRevenueColumnAmt>20440670</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>20440670</RelatedOrExemptFuncIncomeAmt>
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        <ExclusionAmt>0</ExclusionAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>Technology Support Fee</Desc>
        <BusinessCd>611710</BusinessCd>
        <TotalRevenueColumnAmt>226800</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>226800</RelatedOrExemptFuncIncomeAmt>
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        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Health Center Fee</Desc>
        <BusinessCd>611710</BusinessCd>
        <TotalRevenueColumnAmt>126000</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>126000</RelatedOrExemptFuncIncomeAmt>
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        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
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        <BusinessCd>611710</BusinessCd>
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        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Application Fees</Desc>
        <BusinessCd>611710</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>72600</RelatedOrExemptFuncIncomeAmt>
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        <ExclusionAmt>0</ExclusionAmt>
      </ProgramServiceRevenueGrp>
      <TotalOthProgramServiceRevGrp>
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        <ExclusionAmt>0</ExclusionAmt>
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      <InvestmentIncomeGrp>
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        <UnrelatedBusinessRevenueAmt>-345868</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>6285707</ExclusionAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <RoyaltiesRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <GrossRentsGrp>
        <RealAmt>346587</RealAmt>
        <PersonalAmt>0</PersonalAmt>
      </GrossRentsGrp>
      <LessRentalExpensesGrp>
        <RealAmt>36574</RealAmt>
        <PersonalAmt>0</PersonalAmt>
      </LessRentalExpensesGrp>
      <RentalIncomeOrLossGrp>
        <RealAmt>310013</RealAmt>
        <PersonalAmt>0</PersonalAmt>
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      <NetRentalIncomeOrLossGrp>
        <TotalRevenueColumnAmt>310013</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>2812</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>307201</ExclusionAmt>
      </NetRentalIncomeOrLossGrp>
      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>21727123</SecuritiesAmt>
        <OtherAmt>0</OtherAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>8407697</SecuritiesAmt>
        <OtherAmt>28696</OtherAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>13319426</SecuritiesAmt>
        <OtherAmt>-28696</OtherAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>13290730</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>13290730</ExclusionAmt>
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      <ContriRptFundraisingEventAmt>0</ContriRptFundraisingEventAmt>
      <GrossSalesOfInventoryAmt>112704</GrossSalesOfInventoryAmt>
      <CostOfGoodsSoldAmt>83341</CostOfGoodsSoldAmt>
      <NetIncomeOrLossGrp>
        <TotalRevenueColumnAmt>29363</TotalRevenueColumnAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>29363</ExclusionAmt>
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      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>62539964</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>21098333</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>-343056</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>19913001</ExclusionAmt>
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      <GrantsToDomesticOrgsGrp>
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        <ProgramServicesAmt>131499</ProgramServicesAmt>
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      <GrantsToDomesticIndividualsGrp>
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        <ProgramServicesAmt>6442206</ProgramServicesAmt>
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      <ForeignGrantsGrp>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
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      <BenefitsToMembersGrp>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
      </BenefitsToMembersGrp>
      <CompCurrentOfcrDirectorsGrp>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>960188</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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      <CompDisqualPersonsGrp>
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        <ProgramServicesAmt>122847</ProgramServicesAmt>
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        <FundraisingAmt>0</FundraisingAmt>
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        <ProgramServicesAmt>9304716</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1814713</ManagementAndGeneralAmt>
        <FundraisingAmt>1299867</FundraisingAmt>
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        <ProgramServicesAmt>1640355</ProgramServicesAmt>
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        <ProgramServicesAmt>1722678</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1239677</ManagementAndGeneralAmt>
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      <PayrollTaxesGrp>
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        <ProgramServicesAmt>1091656</ProgramServicesAmt>
        <ManagementAndGeneralAmt>370436</ManagementAndGeneralAmt>
        <FundraisingAmt>178919</FundraisingAmt>
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        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
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      <FeesForServicesLegalGrp>
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        <ProgramServicesAmt>2549</ProgramServicesAmt>
        <ManagementAndGeneralAmt>114803</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>147938</TotalAmt>
        <ProgramServicesAmt>11784</ProgramServicesAmt>
        <ManagementAndGeneralAmt>136154</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesLobbyingGrp>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesLobbyingGrp>
      <FeesForServicesProfFundraising>
        <TotalAmt>0</TotalAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesProfFundraising>
      <FeesForSrvcInvstMgmntFeesGrp>
        <TotalAmt>3070058</TotalAmt>
        <ProgramServicesAmt>35</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3070023</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForSrvcInvstMgmntFeesGrp>
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        <TotalAmt>1241462</TotalAmt>
        <ProgramServicesAmt>351309</ProgramServicesAmt>
        <ManagementAndGeneralAmt>844769</ManagementAndGeneralAmt>
        <FundraisingAmt>45384</FundraisingAmt>
      </FeesForServicesOtherGrp>
      <AdvertisingGrp>
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        <ProgramServicesAmt>83918</ProgramServicesAmt>
        <ManagementAndGeneralAmt>192129</ManagementAndGeneralAmt>
        <FundraisingAmt>96696</FundraisingAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
        <TotalAmt>186827</TotalAmt>
        <ProgramServicesAmt>61788</ProgramServicesAmt>
        <ManagementAndGeneralAmt>83553</ManagementAndGeneralAmt>
        <FundraisingAmt>41486</FundraisingAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
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        <ProgramServicesAmt>139337</ProgramServicesAmt>
        <ManagementAndGeneralAmt>286131</ManagementAndGeneralAmt>
        <FundraisingAmt>36736</FundraisingAmt>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </RoyaltiesGrp>
      <OccupancyGrp>
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        <ProgramServicesAmt>3045200</ProgramServicesAmt>
        <ManagementAndGeneralAmt>14562</ManagementAndGeneralAmt>
        <FundraisingAmt>1036</FundraisingAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>419535</TotalAmt>
        <ProgramServicesAmt>77634</ProgramServicesAmt>
        <ManagementAndGeneralAmt>236079</ManagementAndGeneralAmt>
        <FundraisingAmt>105822</FundraisingAmt>
      </TravelGrp>
      <PymtTravelEntrtnmntPubOfclGrp>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </PymtTravelEntrtnmntPubOfclGrp>
      <ConferencesMeetingsGrp>
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        <ExplanationTxt>The collections, which include art work, books, and artifacts of historical significance have been acquired through contributions since the School's inception and are not recognized as assets on the statement of financial position. Contributed collection items are not reflected on the financial statements. Proceeds from deaccessions or insurance recoveries are reflected as increases in the appropriate net asset class.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part III, Line 4</FormAndLineReferenceDesc>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part X, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The School follows FASB ASC 740, Income Taxes, which clarifies the accounting for uncertain tax positions by prescribing the recognition threshold a tax position is required to meet before being recognized in the financial statements. The School recognizes a tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities. Management evaluated the School's tax positions and concluded that the School had no material uncertain income positions as of June 30, 2018 or 2017. The School is no longer subject to income tax examinations by the US federal, state, or local tax authorities for fiscal years before 2015. The School will account for interest and penalties related to uncertain tax positions, if any, as part of tax expense.</ExplanationTxt>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
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      <GovernmentFinancialAidRcvdInd>0</GovernmentFinancialAidRcvdInd>
      <GovernmentFinancialAidRvkdInd>0</GovernmentFinancialAidRvkdInd>
      <ComplianceWithRevProc7550Ind>1</ComplianceWithRevProc7550Ind>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule E, Part I, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>Groton's diversity and inclusion mission statement is noted on its website. It notes that Groton School is committed to diversity and inclusivity with responsibility, mutual respect, and empathy. We strive to maintain a community in which every person feels welcomed, valued, and respected. We are dedicated to shared examination of our different perspectives, inherent privileges, disadvantages, and prejudices, especially in terms of race, religion, national origin, gender and sexuality, socioeconomic status, and political ideology. We believe this work is critical to preparing students to lead "lives of character, learning, leadership, and service."</ExplanationTxt>
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        <SpecificServicesProvidedTxt>Fundraising receptions held in South Korea and China in March 2018.</SpecificServicesProvidedTxt>
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      <AccountActivitiesOutsideUSGrp>
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        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>Program Services</TypeOfActivitiesConductedTxt>
        <SpecificServicesProvidedTxt>School sponsored Global Education trip to India that included fourteen students.</SpecificServicesProvidedTxt>
        <RegionTotalExpendituresAmt>42000</RegionTotalExpendituresAmt>
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      <AccountActivitiesOutsideUSGrp>
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        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
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        <SpecificServicesProvidedTxt>School sponsored Instrumental Music trip to China that included sixteen students.</SpecificServicesProvidedTxt>
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      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>Sub-Saharan Africa</RegionTxt>
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        <EmployeeCnt>0</EmployeeCnt>
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        <SpecificServicesProvidedTxt>School sponsored Global Education trip to Tanzania that included fifteen students.</SpecificServicesProvidedTxt>
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      <AccountActivitiesOutsideUSGrp>
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        <EmployeeCnt>0</EmployeeCnt>
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        <SpecificServicesProvidedTxt>School sponsored Global Education trip to Greece that included eighteen students.</SpecificServicesProvidedTxt>
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      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>Europe (including Iceland and Greenland)</RegionTxt>
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        <SpecificServicesProvidedTxt>Fundraising reception held in London in April 2018.</SpecificServicesProvidedTxt>
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        <SpecificServicesProvidedTxt>Attendance at the WLSA Global Educator Conference in Shanghai in July 2017.</SpecificServicesProvidedTxt>
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        <RegionTxt>East Asia and the Pacific</RegionTxt>
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      <AccountActivitiesOutsideUSGrp>
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        <TypeOfActivitiesConductedTxt>Investments</TypeOfActivitiesConductedTxt>
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      <ForeignPartnershipInd>0</ForeignPartnershipInd>
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        <USAddress>
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          <CityNm>Groton</CityNm>
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        <PurposeOfGrantTxt>The contribution was made to help the Town of Groton subsidize their annual operating costs.</PurposeOfGrantTxt>
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        <ValuationMethodUsedDesc>Total credits applied to tuition</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>Credits are applied to tuition as a means of subsidizing the overall tuition costs to qualified students attending Groton School during the academic year and for the available summer program.</NonCashAssistanceDesc>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
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      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Laptop Grant</GrantTypeTxt>
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        <ValuationMethodUsedDesc>Credits are applied to monthly bill to offset costs</ValuationMethodUsedDesc>
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      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Parent Travel Grant</GrantTypeTxt>
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        <CashGrantAmt>16749</CashGrantAmt>
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        <ValuationMethodUsedDesc>Payments made to subsidize travel related costs for parents</ValuationMethodUsedDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule I, Part I, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The School works directly with town officials and local charitable organizations to assess future needs and the use of current and past monetary grants. The School also makes several other small donations throughout the year based on the charitable purpose, historical relationship, and current need. These one time contributions are not typically monitored by the CFO or Headmaster. Financial aid grants are awarded annually to qualified students and are typically applied as credits to the tuition bill up to the amount of the grant for the current academic year. In some instances, cash payments are issued directly to parents as reimbursement for academic expenses or travel related costs when applicable.</ExplanationTxt>
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        <PersonNm>Temba Maqubela</PersonNm>
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        <PersonNm>Arthur Diaz</PersonNm>
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        <PersonNm>John MacEachern</PersonNm>
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        <PersonNm>Harold W Anderson III</PersonNm>
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        <PersonNm>Ian Gracey</PersonNm>
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        <PersonNm>Elizabeth Preston</PersonNm>
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        <PersonNm>Elizabeth Lawrence</PersonNm>
        <TitleTxt>Development Leadership Gift Officer</TitleTxt>
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        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>Faculty are required to live in on-campus housing as a condition of employment. The Headmaster's home includes some space that is reserved for School related meetings and student activities. The cost of maintaining this allotted space is paid by the School and recorded as an operating expense. The Headmaster's contract, which is approved by the Board President and the Compensation Committee, includes the cost of residential cleaning. The cost is recorded by the School as a taxable benefit and reported on the W-2. The School will only pay for the cost of a traveling spouse when they are an authorized participant in School related functions. In such a case, the cost is treated as a non-taxable work related event. The discretionary account is provided to the Headmaster as part of the approved annual budget. The account is used to fund small School related expenses and, as a result, is not reported as a taxable fringe benefit.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>The salary of Groton's Headmaster is determined annually by the Personnel Committee of the Board. As input to their decision, the committee reviews the results of the annual ABOPS salary survey. ABOPS is a 40-member organization of independent schools whom we consider to be our peers.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>The Headmaster's contract, which is approved by the President of the Board and the Compensation Committee, included an annual $45,000 deferred compensation contribution. The School deposited the initial payment to a qualified 457(b) plan up to the annual IRS limit of $18,000. The remaining balance was deposited to a non-qualified 457(f) plan. Each deposit to the 457(f) plan is subject to a three year vesting period and is distributed once the terms are satisfied.</ExplanationTxt>
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        <RefundingEscrowAmt>48640000</RefundingEscrowAmt>
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        <AnyResearchAgreementsInd>0</AnyResearchAgreementsInd>
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        <PrivateBusConcerningUBIPct>0.002</PrivateBusConcerningUBIPct>
        <TotalPrivateBusinessUsePct>0.011</TotalPrivateBusinessUsePct>
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        <NoRebateDueInd>0</NoRebateDueInd>
        <VariableRateIssueInd>1</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>1</HedgeIdentifiedInBksAndRecInd>
        <HedgeProviderName>
          <BusinessNameLine1Txt>Morgan Stanley Capital Services</BusinessNameLine1Txt>
          <BusinessNameLine2Txt>Bank of New York Mellon</BusinessNameLine2Txt>
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        <TermOfHedgePct>30</TermOfHedgePct>
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        <WrittenProcToMonitorReqsInd>1</WrittenProcToMonitorReqsInd>
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        <BondReferenceCd>A</BondReferenceCd>
        <ProceduresCorrectiveActionInd>1</ProceduresCorrectiveActionInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule K, Part IV, Line 4b-10/17/2013 75,000,000 Massachusetts Development Finance Agency</FormAndLineReferenceDesc>
        <ExplanationTxt>The Bank of New York Mellon Swap 20 year maturity, The Bank of New York Mellon Swap 38 year maturity, and Morgan Stanley Capital Services Swap 38 year maturity.</ExplanationTxt>
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          <PersonNm>Vuyelwa M Maqubela</PersonNm>
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        <RelationshipDescriptionTxt>Family Member of Temba Maqubela</RelationshipDescriptionTxt>
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        <TransactionDesc>Employment</TransactionDesc>
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      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>Eileen Diaz</PersonNm>
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        <RelationshipDescriptionTxt>Family Member of Arthur Diaz</RelationshipDescriptionTxt>
        <TransactionAmt>2371</TransactionAmt>
        <TransactionDesc>Employment</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
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        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>125</ContributionCnt>
        <NoncashContributionsRptF990Amt>1362067</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
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      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
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        <FormAndLineReferenceDesc>Schedule M, Part I, Line 33</FormAndLineReferenceDesc>
        <ExplanationTxt>The number of security contributions is based on the number of gifts and the not the number of shares received.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>A draft of the Form 990 without Schedule B was distributed electronically to each member of the Audit Committee. After a thorough review, the Committee had an opportunity to ask questions and suggest revisions during a group conference call. The draft was also posted to a secure electronic portal, accessible by the full Board, prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>All School officers, key employees, and members of the Board of Trustees are required annually to read the conflict of interest policy and sign the document. The signature indicates an understanding of the guidelines and an assurance to the Board that they are in compliance with the policy. Any potential conflict must be disclosed and reviewed by the President of the Board to determine if further action is required. Any identified conflict will prohibit such individual from participating in the governing body's deliberations and transaction decisions related to the conflict.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>An employment contract between the Headmaster and the School is updated periodically and renewed annually. Each year, the President of the Board and the Compensation Committee review the Headmaster's and other senior administrator's salaries and benefits. The salary survey provided by the Association of Business Officers of Preparatory Schools is used as a guide and a point of comparison. The annual salary and benefit offerings for the Chief Financial Officer are made by the Headmaster. All salaries and benefit offerings for the remaining School employees are updated annually and approved by the Chief Financial Officer or the Headmaster up to the aggregate salary approved by the Board of Trustees.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990 without Schedule B can be viewed on-line by going to guidestar.org, an independently operated website. The conflict of interest policy, governing documents, and financial statements may be viewed any time upon request for the same period of disclosure set forth in Section 6104(d).</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Change in value of interest rate swap agreements 2,180,233, accrued pension liability 1,166,638, split interest agreements 562,625, and recovery of uncollectible pledges (356,226).</ExplanationTxt>
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        <MethodOfAmountDeterminationTxt>The aggregate annual transfers from the fund to the School that represent the value of the fund assigned to the beneficiaries upon their death.</MethodOfAmountDeterminationTxt>
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